[css-contain-3] Remove closed issues and deferred state feature 6402

Author: mirisuzanne

css-contain-3/Overview.bs

@@ -257,8 +257,6 @@ Inline-Size Containment</h3>
 		an <a spec="css-display-3">internal ruby box</a>
 		or a <a spec="css-display-3" lt="atomic inline">non-atomic</a> <a spec="css-display-3">inline-level</a> box
 
-	Issue(1031): Define inline-size containment in more detail
-	(including additional examples)
 
 <h2 id="container-queries">
 Container Queries</h2>
@@ -738,7 +736,6 @@ Container Features</h2>
 	A <dfn export>container feature</dfn>
 	queries a specific aspect of a [=query container=].
 
-	Issue(5989): What container features can be queried?
 
 <h3 id="size-container">
 Size Container Features</h3>
@@ -915,15 +912,6 @@ Style Container Features</h3>
 
 	Issue(6396): Do we like this proposed syntax for style queries?
 
-<h3 id="state-container">
-State Container Features</h3>
-
-	<dfn export>State queries</dfn> allow querying
-	miscellaneous [=query container=] states, such as
-	whether a ''position: sticky'' box is displaced from its in-flow position,
-	or whether the box is visible on screen.
-
-Issue(6402): Define a syntax for state-based container queries
 
 <h2 id="container-lengths">
 Container Relative Lengths: the ''cqw'', ''cqh'', ''cqi'', ''cqb'', ''cqmin'', ''cqmax'' units</h2>